/*
    GNU GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public
    License as published by the Free Software Foundation; either
    verion 2 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
*/
package org.lobobrowser.main;

import java.util.*;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;

/**
 * Global URL stream handler factory used by the browser.
 * @see PlatformInit#initProtocols()
 */
public class PlatformStreamHandlerFactory implements URLStreamHandlerFactory {
	private static final PlatformStreamHandlerFactory instance = new PlatformStreamHandlerFactory();
	private final Collection<URLStreamHandlerFactory> factories = new ArrayList<URLStreamHandlerFactory>();
	
	public static PlatformStreamHandlerFactory getInstance() {
		return instance;
	}
	
	public void addFactory(URLStreamHandlerFactory factory) {
		SecurityManager sm = System.getSecurityManager();
		if(sm != null) {
			sm.checkSetFactory();
		}
		Collection<URLStreamHandlerFactory> factories = this.factories;
		synchronized(factories) {
			factories.add(factory);
		}
	}
	
	public URLStreamHandler createURLStreamHandler(String protocol) {
		Collection<URLStreamHandlerFactory> factories = this.factories;
		synchronized(factories) {
			for(URLStreamHandlerFactory f : factories) {
				URLStreamHandler handler = f.createURLStreamHandler(protocol);
				if(handler != null) {
					return handler;
				}
			}
		}
		return null;
	}
}
